6
6.0

Sep 22, 2013
09/13

by
Fernando Rego Loup

######
6

######
0

######
0

We use the Conformal Metric as described in Kar-Sinha work on Gravitational Bending of Light in a 5D Spacetime to recompute the equations of the 5D Force in Basini-Capozziello-Leon Formalism and we arrive at a result that possesses some advantages. The equations of the Extra Force as proposed by Leon are now more elegant in Conformal Formalism and many algebraic terms can be simplified or even suppressed. Also we recompute the Kar-Sinha Gravitational Bending of Light affected by the presence of...

Source: http://arxiv.org/abs/gr-qc/0603106v5

5
5.0

Sep 23, 2013
09/13

by
Steve Rippl; Henk van Elst; Reza Tavakol; David Taylor

######
5

######
0

######
0

We generalise the equations governing relativistic fluid dynamics given by Ehlers and Ellis for general relativity, and by Maartens and Taylor for quadratic theories, to generalised $f(R)$ theories of gravity. In view of the usefulness of this alternative framework to general relativity, its generalisation can be of potential importance for deriving analogous results to those obtained in general relativity. We generalise, as an example, the results of Maartens and Taylor to show that within the...

Source: http://arxiv.org/abs/gr-qc/9511010v1

13
13

Sep 18, 2013
09/13

by
María Jesús Pareja; Malcolm A. H. MacCallum

######
13

######
0

######
0

Maartens {\it et al.}\@ gave a covariant characterization, in a 1+3 formalism based on a perfect fluid's velocity, of the parts of the first derivatives of the curvature tensor in general relativity which are ``locally free'', i.e. not pointwise determined by the fluid energy momentum and its derivative. The full decomposition of independent curvature derivative components given in earlier work on the spinor approach to the equivalence problem enables analogous general results to be stated for...

Source: http://arxiv.org/abs/gr-qc/0605075v1

4
4.0

Sep 18, 2013
09/13

by
M. Chaisi; S. D. Maharaj

######
4

######
0

######
0

New exact interior solutions to the Einstein field equations for anisotropic spheres are found. We utilise a procedure that necessitates a choice for the energy density and the radial pressure. This class contains the constant density model of Maharaj and Maartens (Gen. Rel. Grav., Vol 21, 899-905, 1989) and the variable density model of Gokhroo and Mehra (Gen. Rel. Grav., Vol 26, 75-84, 1994) as special cases. These anisotropic spheres match smoothly to the Schwarzschild exterior and...

Source: http://arxiv.org/abs/gr-qc/0504098v1

13
13

Sep 18, 2013
09/13

by
Ignacy Sawicki; Yong-Seon Song; Wayne Hu

######
13

######
0

######
0

We develop a scaling ansatz for the master equation in Dvali, Gabadadze, Porrati cosmologies, which allows us to solve the equations of motion for perturbations off the brane during periods when the on-brane evolution is scale-free. This allows us to understand the behavior of the gravitational potentials outside the horizon at high redshifts and close to the horizon today. We confirm that the results of Koyama and Maartens are valid at scales relevant for observations such as galaxy-ISW...

Source: http://arxiv.org/abs/astro-ph/0606285v2

13
13

Sep 20, 2013
09/13

by
Lode Wylleman

######
13

######
0

######
0

In a paper by Maartens, Lesame and Ellis (Class. Quant. Grav. 15, 1005) it was shown that irrotational dust solutions with vanishing electric part of the Weyl tensor are subject to severe integrability conditions and it was conjectured that the only such solutions are FLRW spacetimes. In their analysis the possibility of a cosmological constant Lambda was omitted. The conjecture is proved, irrespective as to whether Lambda is zero or not, and qualitative differences with the case of vanishing...

Source: http://arxiv.org/abs/gr-qc/0601142v1

47
47

Sep 17, 2013
09/13

by
Diego Caceres; Leonardo Castaneda; Juan M. Tejeiro

######
47

######
0

######
0

We present the exact equation for evolution of Bianchi I cosmological model, considering a non-tilted perfect fluid in a matter dominated universe. We use the definition of shear tensor and later we prove it is consistent with the evolution equation for shear tensor obtained from Ricci identities and widely known in literature [3], [5], [9]. Our result is compared with the equation given by Ellis and van Elst in [3] and Tsagas, Challinor and Maartens [5]. We consider that it is important to...

Source: http://arxiv.org/abs/1003.3491v1

6
6.0

Sep 17, 2013
09/13

by
Stacey Hobbs; Peter K. S. Dunsby

######
6

######
0

######
0

Assuming a large-scale homogeneous magnetic field, we follow the covariant and gauge-invariant approach used by Tsagas and Barrow to describe the evolution of density and magnetic field inhomogeneities and curvature perturbations in a matter-radiation universe. We use a two parameter approximation scheme to linearize their exact non-linear general-relativistic equations for magneto-hydrodynamic evolution. Using a two-fluid approach we set up the governing equations as a fourth order autonomous...

Source: http://arxiv.org/abs/gr-qc/0007010v2

6
6.0

Sep 23, 2013
09/13

by
Christian G. Boehmer; Tiberiu Harko; Francisco S. N. Lobo

######
6

######
0

######
0

The classical tests of general relativity (perihelion precession, deflection of light, and the radar echo delay) are considered for the Dadhich, Maartens, Papadopoulos and Rezania (DMPR) solution of the spherically symmetric static vacuum field equations in brane world models. For this solution the metric in the vacuum exterior to a brane world star is similar to the Reissner-Nordstrom form of classical general relativity, with the role of the charge played by the tidal effects arising from...

Source: http://arxiv.org/abs/0801.1375v2

18
18

Sep 21, 2013
09/13

by
Zoltán Keresztes; László Á. Gergely

######
18

######
0

######
0

The 5-dimensional (5d) Birkhoff theorem gives the class of 5d vacuum space-times containing spatial hypersurfaces with cosmological symmetries. This theorem is violated by the 5d vacuum Gergely-Maartens (GM) space-time, which is not a representant of the above class, but contains the static Einstein brane as embedded hypersurface. We prove that the 5d Birkhoff theorem is still satisfied in a weaker sense: the GM space-time is related to the degenerated horizon metric of certain black-hole...

Source: http://arxiv.org/abs/0712.3758v2

10
10.0

Sep 19, 2013
09/13

by
J. M. Aguirregabiria; L. P. Chimento; Ruth Lazkoz

######
10

######
0

######
0

After a more general assumption on the influence of the bulk on the brane, we extend some conclusions by Maartens et al. and Santos et al. on the asymptotic behavior of Bianchi I brane worlds. As a consequence of the nonlocal anisotropic stresses induced by the bulk, in most of our models, the brane does not isotropize and the nonlocal energy does not vanish in the limit in which the mean radius goes to infinity. We have also found the intriguing possibility that the inflation due to the...

Source: http://arxiv.org/abs/gr-qc/0303096v2

6
6.0

Sep 23, 2013
09/13

by
William Stoeger; Marcelo Araujo; Tim Gebbie

######
6

######
0

######
0

Assuming that the cosmological principle holds, Maartens, Ellis and Stoeger (MES) recently constructed a detailed scheme linking anisotropies in the cosmic background radiation (CMB) with anisotropies and inhomogeneities in the large scale structure of the universe and showed how to place limits on those anisotropies and inhomogeneities simply by using CMB quadrupole and octupole limits. First we indicate and discuss the connection between the covariant multipole moments of the temperature...

Source: http://arxiv.org/abs/astro-ph/9904346v1

5
5.0

Sep 19, 2013
09/13

by
Yuri Shtanov; Alexander Viznyuk; Varun Sahni

######
5

######
0

######
0

An outstanding issue in braneworld theory concerns the setting up of proper boundary conditions for the brane-bulk system. Boundary conditions (BC's) employing regulatory branes or demanding that the bulk metric be nonsingular have yet to be implemented in full generality. In this paper, we take a different route and specify boundary conditions directly on the brane thereby arriving at a local and closed system of equations (on the brane). We consider a one-parameter family of boundary...

Source: http://arxiv.org/abs/astro-ph/0701015v3

3
3.0

Oct 23, 2014
10/14

by
McCormack, Joanna; Star, Anita; Beadle, Jacqueline; Maartens, Nadia

######
3

######
0

######
0

This article is from Journal of Eating Disorders, volume 1.AbstractNone

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3980770

221
221

Jun 14, 2009
06/09

by
Maartens, Maarten, 1858-1915

######
221

######
0

######
0

Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=LtEMAAAAYAAJ&oe=UTF-8

211
211

Sep 1, 2008
09/08

by
Maartens, Maarten, 1858-1915

######
211

######
0

######
0

Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=ztUMAAAAYAAJ&oe=UTF-8

331
331

Mar 31, 2008
03/08

by
Maartens, Maarten, 1858-1915

######
331

######
0

######
0

Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.

Topic: Peasantry

Source: http://books.google.com/books?id=jdEMAAAAYAAJ&oe=UTF-8

92
92

Jan 13, 2008
01/08

by
Maarten Maartens

######
92

######
0

######
0

Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=bgEUG8z3xfEC&oe=UTF-8

159
159

May 9, 2008
05/08

by
MAARTEN MAARTENS

######
159

######
0

######
0

Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=ssZfNFz6IpAC&oe=UTF-8

87
87

Jun 18, 2009
06/09

by
Maarten Maartens

######
87

######
0

######
0

Book digitized by Google from the library of the New York Public Library and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=GOcvAAAAMAAJ&oe=UTF-8

422
422

Oct 27, 2008
10/08

by
Maartens, Maarten, 1858-1915

######
422

######
0

######
0

Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=4C4WAAAAYAAJ&oe=UTF-8

Monitoring Unit For Monitoring The Condition Of A Semi-permeable Membrane

Topic: U.S. Patents

119
119

Feb 2, 2009
02/09

by
Maarten Maartens

######
119

######
0

######
0

Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=bgEUG8z3xfEC&oe=UTF-8

314
314

Mar 6, 2009
03/09

by
Maartens, Maarten, 1858-1915

######
314

######
0

######
0

Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=a14rAAAAMAAJ&oe=UTF-8

274
274

May 9, 2008
05/08

by
Maarten Maartens

######
274

######
0

######
0

Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=4XArAAAAMAAJ&oe=UTF-8

65
65

Jul 8, 2009
07/09

by
Maarten Maartens

######
65

######
0

######
0

Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=M2EWAAAAYAAJ&oe=UTF-8

83
83

Apr 10, 2014
04/14

by
Maartens, Maarten, 1858-1915

######
83

######
0

######
0

Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=aa31Z2zLymAC&oe=UTF-8

91
91

Apr 26, 2009
04/09

by
Maarten Maartens

######
91

######
0

######
0

Book digitized by Google and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=3F4WAAAAYAAJ&oe=UTF-8

177
177

Sep 10, 2008
09/08

by
Jozua Marius Willem Schwartz, Maarten Maartens

######
177

######
0

######
0

Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=_tUMAAAAYAAJ&oe=UTF-8

660
660

Jun 5, 2009
06/09

by
Maartens, Maarten, 1858-1915

######
660

######
0

######
0

Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=7tkMAAAAYAAJ&oe=UTF-8

252
252

Sep 7, 2008
09/08

by
Maartens, Maarten, 1858-1915

######
252

######
0

######
0

Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=V7hc9NIEJI0C&oe=UTF-8

157
157

Jun 29, 2009
06/09

by
Maartens, Maarten, 1858-1915

######
157

######
0

######
0

Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=fssMAAAAYAAJ&oe=UTF-8

152
152

Sep 1, 2008
09/08

by
Maarten Maartens

######
152

######
0

######
0

Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=V2sRAAAAYAAJ&oe=UTF-8

125
125

Feb 2, 2009
02/09

by
Maarten Maartens

######
125

######
0

######
0

Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=444rAAAAMAAJ&oe=UTF-8

79
79

Dec 14, 2009
12/09

by
Maarten Maartens

######
79

######
0

######
0

Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=3FgWAAAAYAAJ&oe=UTF-8

204
204

Oct 20, 2008
10/08

by
Maarten Maartens , Jozua Marius Willem Schwartz

######
204

######
0

######
0

Book digitized by Google and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=sqsTAAAAIAAJ&oe=UTF-8

384
384

Sep 1, 2008
09/08

by
Maartens, Maarten, 1858-1915

######
384

######
0

######
0

Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=O8sMAAAAYAAJ&oe=UTF-8

Includes advertising matter

356
356

Mar 11, 2008
03/08

by
Maarten Maartens

######
356

######
0

######
0

Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=aHArAAAAMAAJ&oe=UTF-8

357
357

Jul 25, 2009
07/09

by
Maartens, Maarten, 1858-1915

######
357

######
0

######
0

Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=kbQXAAAAYAAJ&oe=UTF-8

5
5.0

Sep 21, 2013
09/13

by
Roy Maartens

######
5

######
0

######
0

Brane-world models provide a phenomenology that allows us to explore the cosmological consequences of some M theory ideas, and at the same time to use precision cosmology as a test of these ideas. In order to achieve this, we need to understand how brane-world gravity affects cosmological dynamics and perturbations. This introductory review describes the key features of cosmological perturbations in a brane-world universe.

Source: http://arxiv.org/abs/astro-ph/0402485v1

13
13

Sep 19, 2013
09/13

by
Bernard Leong; Anthony Challinor; Roy Maartens; Anthony Lasenby

######
13

######
0

######
0

Cosmic microwave background (CMB) observations provide in principle a high-precision test of models which are motivated by M theory. We set out the framework of a program to compute the tensor anisotropies in the CMB that are generated in braneworld models. In the simplest approximation, we show the braneworld imprint as a correction to the power spectra for standard temperature and polarization anisotropies.

Source: http://arxiv.org/abs/astro-ph/0208015v2

8
8.0

Sep 23, 2013
09/13

by
Alexei V Nesteruk; Roy Maartens

######
8

######
0

######
0

We consider quantum effects of an electromagnetic field in a radiation-dominated almost FRW spacetime. The dominant non-local quantum correction to the photon distribution is a quadrupole moment, corresponding to an effective anisotropic pressure in the energy-momentum tensor.

Source: http://arxiv.org/abs/gr-qc/9511044v1

11
11

Sep 19, 2013
09/13

by
George Ellis; Roy Maartens; Malcolm MacCallum

######
11

######
0

######
0

A usual causal requirement on a viable theory of matter is that the speed of sound be at most the speed of light. In view of various recent papers querying this limit, the question is revisited here. We point to various issues confronting theories that violate the usual constraint.

Source: http://arxiv.org/abs/gr-qc/0703121v2

11
11

Sep 21, 2013
09/13

by
Luca Parisi; Marco Bruni; Roy Maartens; Kevin Vandersloot

######
11

######
0

######
0

Loop Quantum Cosmology strongly modifies the high-energy dynamics of Friedman-Robertson-Walker models and removes the big-bang singularity. We investigate how LQC corrections affect the stability properties of the Einstein static universe. In General Relativity, the Einstein static model with positive cosmological constant Lambda is unstable to homogeneous perturbations. We show that LQC modifications can lead to a centre of stability for a large enough positive value of Lambda.

Source: http://arxiv.org/abs/0706.4431v2

4
4.0

Sep 18, 2013
09/13

by
Roy Maartens; Josep Triginer

######
4

######
0

######
0

Dissipative effects during neutrino decoupling in the early universe create a small backreaction on the Hubble rate, and lead to a small rise in temperature and entropy. We use a simplified thermo-hydrodynamic model, which provides a causal approximation to kinetic theory, in order to estimate the backreaction effects and the entropy production.

Source: http://arxiv.org/abs/astro-ph/9901211v2

4
4.0

Sep 19, 2013
09/13

by
C. A. Clarkson; A. A. Coley; R. Maartens; C. G. Tsagas

######
4

######
0

######
0

We use the cosmic microwave background temperature anisotropy to place limits on large-scale magnetic fields in an inhomogeneous (perturbed Friedmann) universe. If no assumptions are made about the spacetime geometry, only a weak limit can be deduced directly from the CMB. In the special case where spatial inhomogeneity is neglected to first order, the upper limit is much stronger, i.e. a few nano-G

Source: http://arxiv.org/abs/astro-ph/0208364v2

6
6.0

Sep 19, 2013
09/13

by
Neil Humphreys; David Matravers; Roy Maartens

######
6

######
0

######
0

We construct an exact relativistic cosmology in which an inhomogeneous but isotropic local region has fractal number counts and matches to a homogeneous background at a scale of the order of $10^2$ Mpc. We show that Einstein's equations and the matching conditions imply either a nonlinear Hubble law or a very low large-scale density.

Source: http://arxiv.org/abs/gr-qc/9804025v2

7
7.0

Sep 18, 2013
09/13

by
Pankaj Joshi; Naresh Dadhich; Roy Maartens

######
7

######
0

######
0

The origin of cosmic gamma-ray bursts remains one of the most intriguing puzzles in astronomy. We suggest that purely general relativistic effects in the collapse of massive stars could account for these bursts. The late formation of closed trapped surfaces can occur naturally, allowing the escape of huge energy from curvature-generated fireballs, before these are hidden within a black hole.

Source: http://arxiv.org/abs/gr-qc/0005080v1

17
17

Sep 20, 2013
09/13

by
Roy Maartens; Vicenc Mendez

######
17

######
0

######
0

We develop a nonlinear generalisation of the causal linear thermodynamics of bulk viscosity, incorporating positivity of the entropy production rate and the effective specific entropy. The theory is applied to viscous fluid inflation (which is necessarily far from equilibrium), and we find thermodynamically consistent inflationary solutions, both exponential and power-law.

Source: http://arxiv.org/abs/astro-ph/9611205v1